Unreal Engine Issues and Bug Tracker (UE-43060)

Description

When a function contains a local map variable, calling the function causes the editor to crash. This only occurs is the map is defined at the function level, no crash occurs if the map is declared as an actor variable.

Regression:
No- Map variable not available prior to 4.15

Steps to Reproduce

Open UE4 Editor (any project)
Open Level blueprint
Create new function (testFunc)
Add local variable to testFunc
Set variable type to string, then click oval icon to set to Map
Under Default Value, click plus to add element
Add Begin Play node to level blueprint and wire into testFunc call
Compile and PIE

Result:
Editor crashes on PIE

Expected:
PIE runs

Callstack

LoginId:7156c35640f86204e61b8383f45dee17
EpicAccountId:c807849e05a0413d99e379f2802cae9c

Access violation - code c0000005 (first/second chance not available)

UE4Editor_Core!rml::internal::Block::findObjectSize()
UE4Editor_Core!FMallocTBB::Free() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\core\private\hal\malloctbb.cpp:112]
UE4Editor_Core!FMemory::Free() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\core\public\hal\fmemory.inl:52]
UE4Editor_Core!FString::operator=() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\core\public\containers\unrealstring.h:1700]
UE4Editor_CoreUObject!UObject::execStringConst() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:2407]
UE4Editor_CoreUObject!UObject::execSetMap() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:2661]
UE4Editor_CoreUObject!UObject::ProcessInternal() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:948]
UE4Editor_CoreUObject!UObject::CallFunction() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:845]
UE4Editor_CoreUObject!UObject::execVirtualFunction() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:2255]
UE4Editor_CoreUObject!UObject::ProcessInternal() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:948]
UE4Editor_CoreUObject!UObject::CallFunction() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:845]
UE4Editor_CoreUObject!UObject::execVirtualFunction() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:2255]
UE4Editor_CoreUObject!UObject::ProcessInternal() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:948]
UE4Editor_CoreUObject!UFunction::Invoke() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\coreuobject\private\uobject\class.cpp:4525]
UE4Editor_CoreUObject!UObject::ProcessEvent() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:1318]
UE4Editor_Engine!AActor::ProcessEvent() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\engine\private\actor.cpp:678]
UE4Editor_Engine!AActor::ReceiveBeginPlay()
UE4Editor_Engine!AActor::BeginPlay() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\engine\private\actor.cpp:3129]
UE4Editor_Engine!AActor::DispatchBeginPlay() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\engine\private\actor.cpp:3097]
UE4Editor_Engine!AWorldSettings::NotifyBeginPlay() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\engine\private\worldsettings.cpp:183]
UE4Editor_Engine!AGameStateBase::HandleBeginPlay() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\engine\private\gamestatebase.cpp:177]
UE4Editor_Engine!UWorld::BeginPlay() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\engine\private\world.cpp:3435]
UE4Editor_Engine!UGameInstance::StartPlayInEditorGameInstance() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\engine\private\gameinstance.cpp:338]
UE4Editor_UnrealEd!UEditorEngine::CreatePIEGameInstance() [d:\build\++ue4+release-4.15+compile\sync\engine\source\editor\unrealed\private\playlevel.cpp:3420]
UE4Editor_UnrealEd!UEditorEngine::PlayInEditor() [d:\build\++ue4+release-4.15+compile\sync\engine\source\editor\unrealed\private\playlevel.cpp:2515]
UE4Editor_UnrealEd!UEditorEngine::StartQueuedPlayMapRequest() [d:\build\++ue4+release-4.15+compile\sync\engine\source\editor\unrealed\private\playlevel.cpp:1215]
UE4Editor_UnrealEd!UEditorEngine::Tick() [d:\build\++ue4+release-4.15+compile\sync\engine\source\editor\unrealed\private\editorengine.cpp:1522]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [d:\build\++ue4+release-4.15+compile\sync\engine\source\editor\unrealed\private\unrealedengine.cpp:391]
UE4Editor!FEngineLoop::Tick() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3025]
UE4Editor!GuardedMain() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\launch\private\launch.cpp:166]
UE4Editor!GuardedMainWrapper() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UE4Editor!WinMain() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32
ntdll

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Duplicate

Component	UE - Gameplay - Blueprint
Affects Versions	4.15, 4.16

Created	Mar 20, 2017
Resolved	Mar 21, 2017
Updated	Apr 27, 2018

UE-43060

Editor crash when calling function that contains a local Map varaible

Editor crash when calling function that contains a local Map varaible

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